Machinery, maintenance

Another point of interest is that the brain expresses more of the total genetic information in its DNA than does any other organ, perhaps 10-20 times as much. Thus, in addition to the metabolic and maintenance machinery shared by most cell types, neurons contain many unique macromolecules, including enzymes, ion channels, neurotransmitters, and receptors that are not found in other cells. Drugs that target these sites produce selective changes in nervous system activities that are directly related to altered behavior. In some cases the effect is desired while in others this is obviously not the case. 

A program has been developed to perform vibration analysis (i.e.. Reactor Maintenance Memorandum 1011, Rev. 0, "Reactor Maintenance Machinery Vibration Monitoring Program, MVMP"). This document has been evaluated by the staff and is considered to be a valuable tool for both predictive and corrective maintenance. Motor inspection and testing is required by the WMS to be performed periodically in accordance with WI-E-MTR-02, the work instruction provided for normal maintenance and testing of motors. 

DPMO, it is possible to maintenance, machinery, environment and methods. In these terms it is feasible to benchmarking the investment plans. 

Avoiding sick building syndrome requires special consideration of building constmction and maintenance material used. Asbestos, organic solvents, paint sprays, dirty filters, moist environment caused by poorly maintained humidifiers, and dirty HVAC machinery have contributed to the deterioration of indoor air quahty. Nonstop quahty maintenance is required at all times. 

Color Coding. New machinery and equipment must conform to OSHA standards and OEM specifications for color coding. Color coding can also help to speed up maintenance procedures. Examples include lubrication information, orientation, timing marks, torque requirements, etc. 

Too little maintenance results in unexpected failures and consequential major losses of production and/or customers (Figure 7-1). This impractical approach is termed reactive strategy and should be avoided on all important machinery. Optimum maintenance strategy balances reasonable costs with maximum possible availability and reliability. The two main maintenance strategies employed by companies today are labelled predictive strategy and preventive strategy. These are part of a balanced approach as shown in Figure 7-2. 

Maintenance is not a glamorous procedure however, its importance is second to none. Maintenance procedures are always controversial, since the definition of upkeep varies with the individual interpretation of each maintenance supervisor. The latitude of maintenance ranges from strict planning and execution, inspection and overhaul, accompanied by complete reports and accounting of costs, to the operation of machinery until some failure occurs, and then making the necessary repairs. 

The old maxim if it ain t broke don t fix it is very applicable in today s machinery. A study conducted at a major nuclear power facility found that 35% of the failures occurred after a major turnaround. This is why total condition monitoring is necessary in any performance based total productive maintenance system and leads to overhauls being planned on proper data evaluation of the machinery rather than on a fixed interval. 

A practical solution is to digitize the drawings and place them on CD s available to the maintenance and operation department. A good digital file reduces search time and helps the departments do a better job of keeping the machinery operating at their peak efficiency with minimal downtime. 

As with any power equipment, gas turbines require a program of planned inspections with repair or replacement of damaged components. A properly designed and conducted inspection and preventive maintenance program can do much to increase the availability of gas turbines and reduce unscheduled maintenance. Inspections and preventive maintenance can be expensive, but not as costly as forced shutdowns. Nearly all manufacturers emphasize and describe preventive maintenance procedures to ensure the reliability of their machinery, and any maintenance program should be based on manufacturer s recommendations. Inspection and preventive maintenance procedures can be tailored to individual equipment application with references such as the manufacturer s instruction book, the operator s manual, and the preventive maintenance checklist. 

Maintenance of guards on machinery, open vessels, handrails, screens at sampling/ drumming-up points etc. and on glass equipment Use of sparkproof tools where appropriate Record-keeping... 

Are lockout procedures used for machinery deactivation during maintenance ... 

Reduction in maintenance costs for the building fabrics, machinery, and products... 

Flow rate changes are sometimes used in the design of local exhaust systems. An example of this is the use of dampers, blastgates, or valves that are interlocked with the machinery of interest. When the tool is on, the damper is opened and air is exhausted from that hood. When the tool is off, the damper is closed and more exhaust air is available to other parts of the system. These kinds of systems diminish the cost for running the system but increase the cost for installation as well as periodic preventive maintenance. The supply system... 

The heaviest products obtained directly from oil arc lubricants, waxes, asphalt, and coke. These products have both domestic and industrial uses. Lubricants, for example, are applied in the operation and maintenance of industrial equipment and machinery. Asphalt, because it is not reactive to chemicals in the environment, is a superb material of construction in the building of roads and in roofing. It is also used in the waterproofing of concrete, the manufacture of black paints, and as a material lor tire threads, battery housing, electrical insulation, and other applications. The heaviest of all the petroleum products, coke, is used extensively as a major component of industrial electrodes and as a commercial fuel. 

The fact that vibration profiles can be obtained for all machinery having rotating or moving elements allows vibration-based analysis techniques to be used for predictive maintenance. Vibration analysis is one of several predictive maintenance techniques used to monitor and analyze critical machines, equipment, and systems in a typical plant. However, as indicated before, the use of vibration analysis to monitor rotating machinery to detect budding problems and to head off catastrophic failure is the dominant predictive maintenance technique used with maintenance management programs. 

The only useful function of broadband analysis is longterm trending of the gross overall condition of machinery. Typically, sets of alert/alarm limits are established to monitor the overall condition of the machine-trains in a predictive maintenance program. However, this approach has limited value and, when used exclusively, severely limits the ability to achieve the full benefit of a comprehensive program. 

The baseline data set must be updated each time the machine is repaired, rebuilt, or when major maintenance is performed. Even when best practices are used, machinery cannot be restored to as-new condition when major maintenance is performed. Therefore, a new baseline or reference data set must be established following these events. 

Typically, a machine-train s vibration signature is made up of vibration components with each component associated with one or more of the true running speeds within the machine-train. Because most machinery problems show up at or near one or more of the running speeds, the narrowband capability is very beneficial in that high-resolution windows can be preset to monitor the running speeds. However, many of the microprocessor-based predictive maintenance systems available do not have narrowband capability. Therefore, care should be taken to ensure that the system utilized does have this capability. 

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